diff --git a/src/signal_processor/soundsignalprocessor.py b/src/signal_processor/soundsignalprocessor.py
index 46e7a0f..0cf1fe2 100644
--- a/src/signal_processor/soundsignalprocessor.py
+++ b/src/signal_processor/soundsignalprocessor.py
@@ -39,6 +39,9 @@ class SoundSignalProcessor(AbcSignalProcessor):
         """
         soundsample_name = self.soundsensor.getvalue()
 
+        if not soundsample_name:  # No new sample... nothing to do
+            return
+
         try:
             sample_decision = self.soundpreprocessor.preprocesssignal(soundsample_name)
         except Exception as e:
@@ -58,4 +61,4 @@ class SoundSignalProcessor(AbcSignalProcessor):
             os.unlink(soundsample_name)
             return
 
-        os.unlink(soundsample_name)
\ No newline at end of file
+        os.unlink(soundsample_name)